Nature of Disordering in γ-Ga_{2}O_{3}

Area of Science:

• Materials Science
• Crystallography
• Solid-State Physics

Background:

• Polymorphs enable phase engineering for diverse material properties.
• Interpreting complex crystal structures can be challenging.
• Gallium oxide (Ga2O3) exhibits various polymorphs.

Purpose of the Study:

• To clarify the true crystal structure of γ-Ga2O3.
• To address long-standing misinterpretations in theory and experiment.
• To establish a physics framework applicable to polymorphic systems.

Main Methods:

• Lattice mapping based crystallographic analysis.
• Combinatorial crystal structure search.
• Monte Carlo simulations for order-disorder transitions.

Main Results:

• The crystal structure of γ-Ga2O3 has been commonly misinterpreted.
• γ-Ga2O3 is revealed as a disordered form of β-Ga2O3.
• Monte Carlo simulations confirmed the order-disorder transition.

Conclusions:

• Correct interpretation and characterization of γ-Ga2O3 are crucial.
• The established physics provides a new understanding of γ-Ga2O3.
• The findings are broadly applicable to other polymorphic materials.